The amplification effect of river valley topography on seismic response of a tunnel near the valley: simulated by boundary element method

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-06-26 DOI:10.1144/qjegh2022-142
Zhongbai Liu, Tao Zhou, Lei Huang, Xinguang Cheng, Zhen-en Huang
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Abstract

Many tunnels are inevitably built near valley terrain, which greatly amplifies the seismic response of the tunnel. This paper considers the interaction between valley terrain and tunnels, proposes a high-precision indirect boundary element method (IBEM) for simulation, and verifies the correctness of the method. The impact of factors such as incident wave type, incident frequency, and distance between the tunnel and the valley on the seismic response of the tunnel is then analyzed in detail. The numerical analysis demonstrates that the stress of the tunnel can be amplified by approximately twice when the distance between the river valley and the tunnel is 10m due to the scattering and coherence effects of seismic waves. However, when this distance is greater than 50m, the presence of river valleys has little effect on the stress of the tunnel. The stress at the right shoulder of the tunnel and the displacement amplification effect on the valley slope is significant compared to other areas. The findings of this study provide theoretical guidance for the seismic fortification and disaster avoidance of tunnel structures near river valleys.
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河谷地形对山谷附近隧道地震反应的放大效应:边界元法模拟
许多隧道不可避免地建在山谷地形附近,这大大放大了隧道的地震反应。本文考虑了山谷地形与隧道的相互作用,提出了一种高精度的间接边界元模拟方法,并验证了该方法的正确性。详细分析了入射波类型、入射频率、隧道与山谷距离等因素对隧道地震反应的影响。数值分析表明,当河谷与隧道之间的距离为10m时,由于地震波的散射和相干效应,隧道的应力可放大约两倍。然而,当该距离大于50m时,河谷的存在对隧道的应力几乎没有影响。与其他地区相比,隧道右肩的应力和对山谷边坡的位移放大效应显著。研究结果为河谷附近隧道结构的抗震防灾提供了理论指导。
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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